// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// This file contains the implementation of GenericV4L2Device used on
// platforms, which provide generic V4L2 video codec devices.

#ifndef MEDIA_GPU_GENERIC_V4L2_DEVICE_H_
#define MEDIA_GPU_GENERIC_V4L2_DEVICE_H_

#include <stddef.h>
#include <stdint.h>

#include <map>

#include "base/files/scoped_file.h"
#include "base/macros.h"
#include "media/gpu/v4l2_device.h"

namespace media {

class GenericV4L2Device : public V4L2Device {
public:
    GenericV4L2Device();

    // V4L2Device implementation.
    bool Open(Type type, uint32_t v4l2_pixfmt) override;
    int Ioctl(int request, void* arg) override;
    bool Poll(bool poll_device, bool* event_pending) override;
    bool SetDevicePollInterrupt() override;
    bool ClearDevicePollInterrupt() override;
    void* Mmap(void* addr,
        unsigned int len,
        int prot,
        int flags,
        unsigned int offset) override;
    void Munmap(void* addr, unsigned int len) override;

    std::vector<base::ScopedFD> GetDmabufsForV4L2Buffer(
        int index,
        size_t num_planes,
        enum v4l2_buf_type buf_type) override;

    bool CanCreateEGLImageFrom(uint32_t v4l2_pixfmt) override;
    EGLImageKHR CreateEGLImage(
        EGLDisplay egl_display,
        EGLContext egl_context,
        GLuint texture_id,
        const gfx::Size& size,
        unsigned int buffer_index,
        uint32_t v4l2_pixfmt,
        const std::vector<base::ScopedFD>& dmabuf_fds) override;

    EGLBoolean DestroyEGLImage(EGLDisplay egl_display,
        EGLImageKHR egl_image) override;
    GLenum GetTextureTarget() override;
    uint32_t PreferredInputFormat(Type type) override;

    std::vector<uint32_t> GetSupportedImageProcessorPixelformats(
        v4l2_buf_type buf_type) override;

    VideoDecodeAccelerator::SupportedProfiles GetSupportedDecodeProfiles(
        const size_t num_formats,
        const uint32_t pixelformats[]) override;

    VideoEncodeAccelerator::SupportedProfiles GetSupportedEncodeProfiles()
        override;

    bool IsImageProcessingSupported() override;

    bool IsJpegDecodingSupported() override;

private:
    // Vector of video device node paths and corresponding pixelformats supported
    // by each device node.
    using Devices = std::vector<std::pair<std::string, std::vector<uint32_t>>>;

    ~GenericV4L2Device() override;

    bool Initialize() override;

    // Open device node for |path| as a device of |type|.
    bool OpenDevicePath(const std::string& path, Type type);

    // Close the currently open device.
    void CloseDevice();

    // Enumerate all V4L2 devices on the system for |type| and store the results
    // under devices_by_type_[type].
    void EnumerateDevicesForType(V4L2Device::Type type);

    // Return device information for all devices of |type| available in the
    // system. Enumerates and queries devices on first run and caches the results
    // for subsequent calls.
    const Devices& GetDevicesForType(V4L2Device::Type type);

    // Return device node path for device of |type| supporting |pixfmt|, or
    // an empty string if the given combination is not supported by the system.
    std::string GetDevicePathFor(V4L2Device::Type type, uint32_t pixfmt);

    // Stores information for all devices available on the system
    // for each device Type.
    std::map<V4L2Device::Type, Devices> devices_by_type_;

    // The actual device fd.
    base::ScopedFD device_fd_;

    // eventfd fd to signal device poll thread when its poll() should be
    // interrupted.
    base::ScopedFD device_poll_interrupt_fd_;

#if USE_LIBV4L2
    // Use libv4l2 when operating |device_fd_|.
    bool use_libv4l2_;
#endif

    DISALLOW_COPY_AND_ASSIGN(GenericV4L2Device);

    // Lazily initialize static data after sandbox is enabled.  Return false on
    // init failure.
    static bool PostSandboxInitialization();
};
} //  namespace media

#endif // MEDIA_GPU_GENERIC_V4L2_DEVICE_H_
